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Note 1 - Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Property, Plant and Equipment [Table Text Block]
           
Accumulated
          
           
Depreciation and
    
Carrying
  
   
Cost
    
Amortization
    
Value
  
December 31, 2018:
  
(Dollars in thousands)
  
Sales facilities (Note 2)
   $
59,374
     $
(26,920
 )   $
32,454
  
Airplane
    
31,013
      
(9,488
 )    
21,525
  
Computer software and equipment
    
21,507
      
(19,374
 )    
2,133
  
Leasehold improvements
    
6,827
      
(5,188
 )    
1,639
  
Other
    
1,577
      
(1,161
 )    
416
  
Total
   $
120,298
     $
(62,131
 )   $
58,167
  
                         
December 31, 2017:
                        
Airplane
   $
30,423
     $
(8,866
 )   $
21,557
  
Computer software and equipment
    
20,287
      
(17,611
 )    
2,676
  
Leasehold improvements
    
6,600
      
(4,765
 )    
1,835
  
Other
    
1,361
      
(990
 )    
371
  
Total
   $
58,671
     $
(32,232
 )   $
26,439